These keyrings are compatible with all keys and keycards, except skull keys. 

One of the most recognizable cheat codes in gaming - typing in IDKFA in Doom 1/2 would give you all keys, all weapons, and full ammunition. What happens next is universal for every player - a chaotic vortex of bullets, shells, rockets, and plasma rounds blasting all demons into oblivion - and they can't even hide behind locked doors.

.: Material: acrylic plate with TPU cover
.: Quality hardware fitting
.: Round shape
.: Key ring included

Doom is a video game series and media franchise created by John Carmack, John Romero, Adrian Carmack, Kevin Cloud, and Tom Hall - ID Software at the time - and all rights belong to them. If you haven't already, you should play it - it's hellishly good!

Read more about it here.

Immerse yourself in Doom with a vid below ↓